Oh and I always wonder why Marik is so popular with the girls.Is it becaus his belly is showing even when he has his pink shirt on?

Hair, face, style (not just because it shows off his belly lol. It's the whole style package), personality and realistic motives due to his past. Also it's how the story incorporated him into the show. Everything.

And it's PURPLE XD Twily!!!!!!!!!!

He isn't one of those sadist god-complex characters that I grew tired of.